期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 34, 期 9, 页码 772-778出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201200811
关键词
aggregation; chemosensor; crown ether; fluorescence; potassium
资金
- World Class University program through the National Research Foundation (NRF) of Korea
- Basic Science Research Program through the National Research Foundation (NRF) of Korea
- Ministry of Education, Science and Technology, Korea [R31-2008-000-20004-0, 2012K1A2B1A03000406, 2012R1A2A2A06045327]
A cationic conjugated polyelectrolyte was designed and synthesized based on poly(fluorene-co-phenylene) containing 5 mol% benzothiadiazole (BT) as a low energy trap and 15-crown-5 as a recognizing group for potassium ions. A potassium ion can form a sandwich-type 2:1 Lewis acid-based complex with 15-crown-5, to cause the intermolecular aggregation of polymers. This facilitates inter-chain fluorescence resonance energy transfer (FRET) to a low-energy BT segment, resulting in fluorescent signal amplification, even at dilute analyte concentrations. Highly sensitive and selective detection of K+ ions was demonstrated in water. The linear response of ratiometric fluorescent signal as a function of [K+] allows K+ quantification in a range of nanomolar concentrations with a detection limit of approximate to 0.7 x 109 M.
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